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Ijlsni/Leitswnif C)F GRADUATE COLLEGE BIOSYSTEMATICS OF IJlSni/lEItSWnif C)F GRADUATE COLLEGE BIOSYSTEMATICS OF NORTH AMERICAN SPECIES OF (LAMIALES) A Dissertation SUBMITTED TO THE GRADUATE FACULTY in partial fulfillment of the requirements for the degree of DOCTOR OF PHILOSOPHY By PHILLIP TERRY CRAWFORD Norman, Oklahoma 2003 UMI Number: 3109064 INFORMATION TO USERS The quality of this reproduction is dependent upon the quality of the copy submitted. Broken or indistinct print, colored or poor quality illustrations and photographs, print bleed-through, substandard margins, and improper alignment can adversely affect reproduction. In the unlikely event that the author did not send a complete manuscript and there are missing pages, these will be noted. Also, if unauthorized copyright material had to be removed, a note will indicate the deletion. UMI UMI Microform 3109064 Copyright 2004 by ProQuest Information and Learning Company. All rights reserved. This microform edition is protected against unauthorized copying under Title 17, United States Code. ProQuest Information and Learning Company 300 North Zeeb Road P.O. Box 1346 Ann Arbor, Ml 48106-1346 Copyright by PHILLIP TERRY CRAWFORD 2003 All Rights Reserved. BIOSYSTEMATICS OF NORTH AMERICAN SPECIES OF (LAMIALES) A DISSERTATION APPROVED FOR THE DEPARTMENT OF BOTANY AND MICROBIOLOGY BY r. jÆ lisens, CommitteCommittee chair Ml. Dr. Ola M. Fincke c Slo/arla Dr. Gordon E. Uno Dr. Linda L. Wallace ACKNOWLEDGEMENTS This research project was funded through grants provided to the primary author by the University of Oklahoma Graduate Student Senate. Additional research funds were provided through a National Science Foundation grant BSR-8708369 to Dr. Wayne J. Elisens. I would like to recognize the members of my graduate committee for their critical reviews of this project. In addition, Dr. Scott Russell made available microscopes and imagingequipment in the Samuel Roberts Noble Electron Microscopy Laboratory; Mr. Bill Chissoe and Mr. Greg Strout provided advice and assistance in the operation of that equipment. Dr. Gordon Uno provided the use of a controlled-environment chamber and support through summer assistantships. Mr. Dan Hough provided invaluable assistance with computers and software. IV TABLE OF CONTENTS Page ACKNOWLEDGEMENTS iv LIST OF TABLES vii LIST OF FIGURES viii LIST OF APPENDICES x ABSTRACT OF DISSERTATION xi CHAPTER I. Genetic Variation and Reproductive Biology of North American species of Nuttallanthus (Lamiales) 1 Abstract 2 Introduction 4 Materials and Methods 7 Results 12 Discussion 19 Literature Cited 31 Tables 38 Figures 53 Appendices 59 CHAPTER n. Morphological Variation and Systematics o f North American species of Nuttallanthus (Lamiales) 81 Abstract 82 Introduction 84 Materials and Methods 87 Page Results 91 Discussion 96 Literature Cited 100 Tables 104 Figures 117 Appendix 133 VI LIST OF TABLES Page CHAPTER I. Genetic Variation and Reproductive Biology of North American species o îNuttallanthus (Lamiales) 1. Collection data for populations of three species examined for isozyme variation 38 2. Genetic identity coefficients among populations 43 3. Summary of allozyme variation 44 4. Nei's genetic diversity statistics 49 5. Observed and expected frequencies of heterozygotes 50 6. Wright’s F statistics 51 7. Intra- and interspecific seed production following controlled pollinations 52 CHAPTER II. Morphological Variation and Systematics of North American species of Nuttallanthus (Lamiales) 1. Collection data for populations of three Nuttallanthus species examined for morphological and chromosome number variation 104 2. Morphological characters examined 109 3. Descriptive statistics for morphological characters 112 4. Discriminant function analysis of morphological characters 116 vii LIST OF FIGURES Page CHAPTER I. Genetic Variation and Reproductive Biology of North American species of Nuttallanthus (Lamiales) 1. Collection localities for populations of three Nuttallanthus species examined for isozyme variation 53 2. UPGMA phenogram of populations derived from Nei’s (1972) genetic identity 55 3. Three-dimensional plot of MDS analysis of Nei’s (1972) genetic identities 57 CHAPTER n. Morphological Variation and Systematics of North American species of Awrtu/ZuMtAwj' (Lamiales) 1. Collection localities for populations of three Nuttallanthus species examined for morphological and chromosome number variation 117 2. SEM micrograph of whole seed of Nuttallanthus canadensis 119 3. SEM micrograph of longitudinal ridge and face on seed of 119 4. SEM micrograph of distal end of seed of AwiZaZZoM^Aws' 119 V lll Page 5. SEM micrograph of unicellular papilla on seed of Nuttallanthus canadensis 119 6. SEM micrograph of whole seed of AWfaZ/anfAity 121 7. SEM micrograph of multicellular tubercles on seed of Nuttallanthus texanus 121 8. SEM micrograph of whole seed of Nuttallanthus texanus 121 9. SEM micrograph of longitudinal ridge on seed of TVwMaZZantAfty teuranwg 121 10. SEM micrograph of whole seed of yZonWaMw,; 123 11. SEM micrograph of distal end of seed of 123 12. Two-dimensional plot of PC A analysis of 35 reproductive and vegetative characters 125 13. Two-dimensional plot of PC A analysis of 26 reproductive characters 125 14. Two-dimensional plot of PC A analysis of 9 vegetative characters 127 15. Two-dimensional plot of PCA analysis of population means 127 IX Page 16. Three-dimensional plot of PC A analysis of population means of 35 reproductive and vegetative characters 129 17. UPGMA phenogram of populations derived from average taxonomic distance 131 LIST OF APPENDICES CHAPTER I. Genetic Variation and Reproductive Biology of North American species of Nuttallanthus (Lamiales) 1. Diagrams of composite banding patterns of alleles of scored loci 59 2. Genotype data for loci from 60 populations of three species of AwfW/aMfAwj: 61 3. Summary allele frequencies for 14 loci in three species of Vw/ta/ZantAwi' 75 4. Fixation indices for 14 loci in 42 populations of three species of 77 CHAPTER n. Morphological Variation and Systematics of North American species of Nuttallanthus (Lamiales) 1. Eigenvalues and loadings from principal component analysis of morphological variation 133 ABSTRACT OF DISSERTATION The native North American toadflaxes comprise a morphologically variable complex of herbaceous plants that have been collectively recognized as a section of Linaria (Linaria section Leptoplectron) or a distinct genus {Nuttallanthus D. Sutton) and individually assigned to specific or varietal rank. High levels of intraspecific morphological variation and intergradation in the morphological characters used to distinguish among these taxa have led to diverse taxonomic treatments of the members of this group. This study represents the first use of enzyme electrophoresis to examine patterns of genetic variation in this species complex. Despite their wide geographic distribution and showy, fragrant flowers (seemingly adapted for insect pollination and outbreeding) the extent and distribution of genetic variation at the populational level was similar to that of narrowly distributed, autogamous species; a low level of detected heterozygotes suggested a high degree of inbreeding in these taxa. Field and greenhouse breeding-system studies indicated that individuals of all three species were entirely self­ compatible and that the primary reproductive strategy of these taxa involved cleistogamy and self-pollination. No hand-performed cross pollinations among species resulted in the successful development of capsules and seeds, indicating that these species were reproductively isolated in areas of sympatry. Univariate and multivariate analyses of morphological characters measured from field-collected samples revealed significant morphological gaps among taxa and consistently separated samples into three primary clusters corresponding to the currently circumscribed species; strong and significant correlations between patterns of morphological and genetic variation were observed among populations and species. The observed morphological discontinuities separating XI groups in this genus and the close correspondence of extensive morphological and genetic gaps among these taxa are concordant with the observed cross-incompatibility among species; these results strongly support the recognition of three species in North American Due to similar genetic divergence values among species, phylogenetic relationships in Nuttallanthus remain unresolved. Patterns of genetic and morphological differentiation within and among these species suggests a long history of reproductive isolation due to biotic and paleogeographic barriers to gene flow. xn CHAPTER 1. GENETIC VARIATION AND REPRODUCTIVE BIOLOGY OF NORTH AMERICAN SPECIES OF (LAMIALES) ABSTRACT The native North American toadflaxes comprise a morphologically variable complex of taxa that have been collectively recognized as a section of linann (Zmonn section or a distinct genns D. Sutton) and individually assigned to specific or varietal rank. To assess patterns of genetic variation within and among species, starch gel electrophoresis was employed to examine 15 scorable isozyme loci for 50 populations. Species are widely distributed geographically, occur in structurally-homogeneous populations ranging in size from one to thousands of individuals, and possess showy, fragrant flowers seemingly adapted for insect pollination and outbreeding. Despite these characteristics, the amount and apportionment of genetic variation within and among populations was similar to that of narrowly distributed, autogamous species.
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